Automatic duplex check and stop valve.



No. 693,133. Patented Feb. l l, I902.

I F. VHENNEBIOHLE. AUTOMATIC DUPLEX cHEcK AND STOP V-ALVE.

(Applicatiog filed May 4, 1 901 (No Moder.)

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UNITE TATES ATENT FFICE,

FRANK IIENNEBCHLE, OF SOUTH CHICAGO, ILLINOIS.

AUTOMATIC DUPLEX CHECK AND STOP VALVE.

SPECIFICATION forming part of Letters Patent No. 693,133, dated February 1 1, 1902.

Application filed May 4;, 1901- Serial No. 58,802. (No model.)

To all whom, it may concern:

Be it known that I, FRANK I-IENNEBoHLE, residing at South Chicago, in the county of Cook and State of Illinois, have invented a 5 new and Improved Automatic Duplex Check and Stop Valve, of which the following is a specification.

This invention relates to improvements in that type of fiuid-pressure-operated valves arranged to automatically adjust themselves under varying pressures from the supply or offtake sides, whereby to stop the feed in case the rupture is on the delivery or outlet end and out off or check the pressure on the outlet side in case the rupture or break occurs in the feed end; and it more especially seeks to provide a very simple, inexpensive, easilyadjusted, and efiectively-operating valve of the character stated more especially designed for use in the main pipe from boiler to engine,

and to maintain the steam-pressure in boiler in case break or leakage is at engine,'or to check steam in the main for engine in case the break is at boiler while repairs are made.

My invention in its generic nature comprehends a valve-chamber having two compartments, one of which communicates with the boiler-inlet, the other with the outlet or offtake main, the two compartments being in communication with each other,and the opening therebetween having cooperatively combined therewith a valve shiftable by the varying pressures from either side, whereby. to close off communication between the'inlet and outlet of the valve-casing.

Again, in'its more complete nature my invention embodies a valve-casing having an inlet-compartment that joins with the boiler, an outlet-compartment, the two compart- 40 ments being in communication, a single slidable valve-stem carrying a valve adapted to operate to close off either the inlet from the boiler-feed or the inlet to the offtake-main by the reduction of pressure from opposite sides, and manually-operated means for forcing the valve from the seat, to which it is held by boiler-pressure.

Inits subordinate nature my invention consists in certain new featuresof construction and detailed combination of parts, all of which will hereinafter be fully described, and particularly pointed out in the claims, reference being had to the accompanying drawings, in

which- Figurel is a vertical section of an angleval've constructed in accordance with my invention. Fig. 2 is a similar view with a slightly-modified construction of the cut-off valve devices.

In the accompanying drawings, in which like letters denote like parts in both figures, P designates the casing of the valve, which in the form shown is of the angle type. This casing has an upper and lower compartment or chamber, (indicated by A A, respectively,) the upper one, A of which has an outlet 13, that connects with the offt-ake-main or engine, while the lower chamber A has the inlet A from boiler. The upper chamber A is also open at the top, which is closed by a cap and yoke Q, which is fastened on the ground joint S by screw-studs s, and the said cap has a stuffing box or gland N, held on the cap by the screw-studs n n, to receive the adjusting screw or spindle I, the purpose of which will presently appear, the upper end of said screw I working in a sleeve-nut R, held on the yoke Q, and its upper end carries a hand-wheel K, and at its lower end it carries a head M to engage the seat on on the under face of the cap, as clearly shown in the drawings.

The chamber A has a supplemental pendent portion a, in which is disposed a spider-frame D, having an annular member having a valve seat D threaded into an annular threaded rim a in the bottom of chamber A proper and a central bearing d to receive the lower end of the vertically-slidable valvestem F.

C designates a second spider-frame detachably held in the opening a between the two chambers, and in the form shown in Fig. 1 this frame C has an annular valve-seat C on its under side, which opposes the seat D below it, and a central guide-bearing c to receive the upper end of stem F.

E designates a double-faced valvedisk mounted on the stem F, and within chamber A said disk has bevel-seats e e on the upper and lower faces, adapted'to cooperate with the beveled seats C and D, respectively, of r the casing in a manner presently explained.

H is a coiled spring disposed about the stem F between the disk E and bearingc, and

has for its object to hold the valve-disk E down toward the boiler-pressure. vGr designates a light coiled spring, which has for its purpose to hold'the Weight of the valvedisk slightly up from its seat to prevent the hammering or clinking of the valve against the seat by the pulsation of steam.

So far as described the manner in which my construction of valve operates is eX- plained as follows: When it is desired to out Oh the boiler-pressure, the screw-spindle I is turned down to push the stem F down to bring the valve-disk E, with its under bevel 6, solid against the valve-seat D, as shown in dotted lines in Fig. 1. To open the valve, the screw I is raised full open until its head M is solid against its seat, as shown in full lines in Fig. 1. The boiler-pressure (if in excess of the pressure in steam-main) will lift valve-disk E up, as shown, pass up into chamberA, into chamberA and out through discharge B into the olftake or steam main, it being understood that during this operation the spring II tends to hold the disk E down against the pressure and toward its seat D, and in practice the said spring H is made sufliciently strong to allow for slight variation of the steam in main and allow said valve-disk E to move up and close against the upper seat 0 only at a certain or predetermined drop of steam-pressure in the'main below the boiler-pressure. Thus should a rupture or break occur in the main and the pressure in the main be sufliciently lower than boiler-pressure to counterbalance the back pressure of the spring H the boilerpressure will move disk E up and hold it lightly against the seat 0, and in consequence cut off the boiler from engine or steam-main during repairs. To again set valve into an operative condition after the repairs are made to engine or main, it is only necessary to screw down the spindle I, the head M of which in engaging stem F will force the valve-disk E down from the seat 0, from which it will be held by the steam-pressure above it when the pressure in the valve from the boiler balances in the valve casing. Should a rupture or break occur in the boiler and the pressure from boiler fall below that of the pressure on the main, the disk E will be instantly shifted to close down against the seat D, and thus close off the main and engine from boiler pending repairs, it being obvious that when pressure in boiler is restored above that of pressure in main back of disk E said restored boiler-pressure will again lift the diskE from seat D.

Under some conditions itis desirable to use two valve-disks on the stem F, as shown in the modified construction illustrated in Fig. 2, in which L designates the second disk mounted on the upper end of the stem F and movable within the chamber A In this lat It will thus be seen that valve E prevents steam getting out of boiler when the break occurs in main, and by reason of the manner in which it and the stem Fis held the action of the valve is entirely automatic for promptly closing in whatever direction the steam diminishes in pressure toacertain point below that for which the spring His inserted-2'. 6.,

should the rupture occur in boiler thestem F, with valves, will descend, and if break or serious leak happens to steamrpipethe stem, with valve, ascends.

By using two disks on the stem F, as shown in Fig. 2, my improvements are also suitable for horizontalpipes by putting the inlet A opposite outlet 13 and to discharge into chamber A, which in such case would be closed at bottom and have the shape of an ordinary globe-valve.

Slight changes in the details of construction. and further 'modifications of the parts may be made without departing from the scope of the appended claims. For example, a wing-style valve may be substituted for the disk on the stem F.

Having thus described my invention, what I claim, and desire to secure by Letters Patout, is I 1. A valve, comprising a casing having an inlet for connecting with the boiler, an outlet for joining with the main or feed pipe, a valvechamber joining the inlet and outlet portions, said chamber having a valve-seat communieating with the outlet, and avalve-seat communicating with the inlet, a valve shiftably held within said chamber adapted to automatically close onto either of said seats by the varying fluid-pressure against it in either direction, for the purposes specified.

2. A valve, comprising two communicating chambers A A the opening therebetween having a valve-seat, the chamber A having a laterally-projecting outlet for connecting with the main, the chamber A having a valveseat adjacent its inlet or boiler-connecting end,a valve held within the chamber A, away from either valve-seat by the balanced fluidpres'sure on its opposite sides and adapted to shift to engage either seat by the varyin g pressure on either side, as specified.

, 3. A valve comprisinga casing, having two communicating chambers, one of which has an inlet, the other an outlet, a valve shiftably held within the inlet-chamber, adapted to alternately close the inlet to said chamber, or the opening between it and the outlet-chamber, to be held up against the said opening by boiler-pressure, and manuallyoperated means for forcing said valve away from the said outlet-opening, and against its boilerpressure, for the purposes described.

4. The combination with the casing, having an inlet-chamber and an outlet-chamber, the two chambers communicating, a shiftable stem, having attached means for alternately closing off the inlet-chamber to the outletchamber or to the boiler, by the varying fluidpressures from opposite directions, said stem and its attached closure means being springpressed in the direction of the inlet to the valve-casing, as set forth.

5. The combination with the casing, having an inlet-chamberA, an outlet-chamber A an opening joining the two chambers, having a valve-seat, a stem slidably mounted within the casing having attached closure means for engaging the valve-seat, a spring for forcing the stem and its closure member normally in the direction of the inlet end of the casing, and a second spring for holding said closure member off the entrance to the inlet-chamber, all being arranged substantially as shown and described. I

6. The herein-described improvements in valves, comprising the following elements in combination, a casing having an inlet-chamber A and an outlet-chamber A in communication with each other, the skeleton frames 0 D, having the valve-seats O and D, and central guide members 0 and cl, the cap and yoke, detachably mounted over the chamber A the screw-spindle I, carried by the yoke and cap, and adjustable within the upper or outlet chamber A the stem F, slidably mounted in the guides c and d, the disk E, mounted on the stem F, and having its upper and lower faces fitted to engage the seats D and C, the spring H, and the spring G, all being arranged substantially as shown and for the purposes described.

FRANK HENNEBOHLE.

Witnesses:

JOHN ScHILL, JOSEPH STUPAR. 

